Apple first acknowledged it was working on fixing the problem at the start of the month.

Earlier, Germany's IT security agency (the Federal Office for Information Security) warned that the exploit, as used by JailbreakMe, exposed "critical weaknesses" that could be used by cyber baddies to take a butchers at your iDevice's confidential data.

It stated that just clicking on an infected PDF file would be "sufficient to infect the mobile device with malware without the user's knowledge".